Improvement in globe-valves



matted tant strut @imita AND LOVIAS D. TOWSLEY, OF SAME PLACE.

Letters Patent No. 94,394, dated August31,1869.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it' may'concern Be it known that I, HENRY BURT, of the cityof Newark, in the State of New Jersey, havemade certain Improvements inGlobe-Valves; and declare the following, taken in connection with theaccompanying drawings, to be a full, clear, and exact description of thesame.

The nature of my improvements consists in so oonstructing a valve thatall needed implements for revolving andl grinding it upon its seat shallform part and parcel of the stem itself, or bc the handle upon one partof av compound stem 5 and in a spring, to prevent leakage from thecompound stein.

In the accompanying drawings- A shows a globe-valve, in section, withall its various parts B shows the same globevaive in' perspective;

C is the improved valve-seat;

D is the valve; and

E, the spring.

The interior of the globe is of the usual form, the shell being in thiscase in three pieces, 1, 2, 3. 1 is the globe and pipe-nuts; 2 is theshank; and 3, a stuffing-box.

The outer stem, 4, has upon it a thread, corresponding with thescrewthread in shank 2, and stuingbox 3, and upon its outer end,one-half of the split wheel 5 is secured,fthe inner end of 'the stempressing against the back of the valve D, forcing it close to the seatC, by turn of the wheel 5.

The inner stem, (i, can revolve in the outer stem. At its inner end thevalve D is held on by a screw, the hole in the valve being made with twoparallel sides, and two angular sides, and the end of the stemcorresponding thereto. When required to be removed, the valve willbecertain to stand in the same position when it shall be replaced on thestein. The valve, of

course, must thus revolve with the stem.

O11 the outer end of' the stem 6, the outer half of the split wheel 5 issecured, which can have a handle, 7,150 be used in turning they stem andthe valve.

In the interior of the aperture, through the interchangeable valve-seatC, at the opposite end to lthe seat proper, two knobs, ,8 8, are cast,fast, projecting,

if deemed necessary, beyond the end of the screw, to be used in turningin or out the removable valveseat G.

A recess in each half of the split wheel 5 receives the. spiral splitspring E, which forces together the back of the valve D and the end ofthe outer stem 4. A recess for packing or grease can be there or not, asdeemed best, the object being to prevent the leakage of steam when thevalve is open, from between the end of the stein and the valve.

As in all water there is more or less grit, in practice it is found tobe arrested and held between the valve and theseat, the pressure of theclosing-screw, even if crushin g particles still, retains it vwherecrushed, it preventing the perfect closing of the valve, and causingirregularities in the`suri`aces .of the valve and the seat, the valve issoon-out of repair.

Provision has heretofore been made forrevolving the valve in ways thatrequired the use of tools not always at hand, and the slight motionneeded to grind the grit, distributing or ejectng it, is, in practice,almost sure to be neglected until the. seat is wholly unfit for use.

By turning the whole wheeluntil the valve just touches the seat, andthen revolving the outer half of the spht wheel 5, and, of course,therewith the valve, the faces of the valve and seat are ground to aperfect iit, which, 'as in our construction, having the.

means wherewith to do this always on hand when closing the valve, willnot be likely to be neglected; ,and thus a steam-tight valve is at anengineer-s cornmand.

What I claim, and desire to secure by Letters Pat ent is- 1. The doubleor split hand-wheel 5, combined with the compound stems 4 and 6, asspecified and shown.

2. The spring E, in combination with the split or double Wheel 5, andthe` compound stem 4 and 6, for

the object set forth.

HENRY BURI.

Witnesses:

W. M. Goonnve, EDWARD GoLLvnn.

